LiTeRo, the (Li)ttle (Te)lepresense (Ro)bot. Make a little RasPi-powered rover scoot around and do stuff.
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LiTeRo, the (Li)ttle (Te)lepresense (Ro)bot

This python sketch is used in conjunction with phraser.php and litero.html to make a little RasPi-powered rover scoot around and do stuff.

Features included by default (Used GPIO pins also listed):

  • MJPEG Streamer
    • 160-175deg Wide Angle Camera Module with White/IR LED modules For Raspberry Pi (Banggood)
  • RPi.GPIO
    • HG7881 (L9110) Dual Channel Motor Driver (GPIO Pins 17, 18, 22, 27)
    • Navigation LED (2N2222 mod for White/IR LED module) (GPIO Pin 23)
    • Servo control! (Optional, not used by default. Pin 19)
  • eSpeak Text-To-Speech
    • LM4871 audio amp conected to GPIO pin #13 (see: PWM1 on GPIO #13 (ALT0) for RasPi Zero W)
  • MinIMU-9 (I2C x2)
  • ADS1115 ADC (Refer to Adafruit tutorials for setup) (I2C)
  • sSMTP

Basic operation: reads from a short text file in RAM (/dev/shm/input.txt) at about 60Hz with parameters that are set at will by a PHP script. The PHP script is being called as the client(s) send in new commands (ex: ./phraser.php?ID=546939&CT=1521479887886&M1=90&M2=90). The client in return gets an XML response that this Python program creates in RAM (/dev/shm/output.txt) along with an ongoing live view from the bot using MJPEG-Streamer.

LiTeRo by default will speak its local ip address on bootup. It will also guide you through the magnetic compass calibration when mag_calibration.txt is removed before bootup.

Things to prepare your Raspberry Pi or Raspberry Pi Zero

  • For the Raspberry Pi Zero, you should enable audio out on one of the GPIO pins in order to use TTS (see: PWM1 on GPIO #13 (ALT0) for RasPi Zero W).
  • Make sure Apache, PHP, Python, SSMPT, mjpeg-streamer, eSpeak, and the Adafruit_ADS1x15 Python library are installed for FULL functionality.
  • Enable i2c and ssh
  • Make "" run on startup. Put the following in /etc/rc.local
#my telepresence bot code
sleep 30s
sudo python /var/www/html/ &
More information can be found on
- Michael H.